Respect your neighbor's quiet - Palo Alto has restrictions on when contractors can work, make sure all subs are aware of the times and respect them. M-F 8 to 6, Sat 9-6 and no work on Sunday or Holidays (BTW Martin Luther King Day and President's Day are holidays.) Contractors are subject to a fine if they violate these rules. This is a noise ordinance, beeping, backing up dump trucks count, cement mixers count, contractors doing paperwork do not. Contractors tend to enjoy working early hours, but your neighbors will NOT appreciate noise at 7 am. Keep the music to a reasonable level. Keep swearing to a quiet volume.
Respect your neighbor's property - If at all possible, do not have any contractors park in front of a neighbors home - especially on a daily basis. Do not block a neighbors driveway (seems like an obvious one, but you'd be surprised.) Do not store construction equipment or anything else on a neighbor's property. (Again, seems obvious...)
Respect your neighbors cleanliness - job sites are are hard to keep neat, especially if you pile trash in the yard instead of a dumpster. Make sure garbage does not blow on to your neighbors yard. Try to keep the view from their windows as pleasant as you can. If you live really close to a neighbor - offer to get their windows cleaned when you are done with construction (or once during the process if it is a long one.) Cleaning out cement mixers, paint cans, etc. has rules and the remnants should certainly not end up in front of your neighbors. Clean up cigarette butts.
Remind your contractor that to him/her its a job site - to everyone else its a neighborhood complete with sleeping babies, kids on bikes, neighbors who like to garden in peace, etc.